Ive run into stretches like that too. A while ago, every time during hard maneuvers, my plane would seem to just freeze up and fall out of the air. When I finally thought of it, I checked my controller calibration, I was seeing lots of spiking on my control axes. Got a new stick after that.
More recently, I was seeing stuff similar to you, collisions, tail shot off, can't get hits, etc. I went back to a hardwired network connection after trying a wireless adapter, and although its only been a few days I think things have improved. Have you checked your net status in the game?
Oh, plus I made it a point to fly with squaddies - can't underestimate the help you get when flying with guys who check 6 and shoot bandits off your tail.
Hey another simple thing to try is up a completely different airframe. If you usually fly a 51, try flying a Zeke instead. Something with opposite characteristics that will make you "think" about how you fly again. Its another way out of a rut you might not even realize you're in.
Point is hellwolf, don't give up the ship! I've been here lots longer than you and I don't have your kill/death ratio. My fun/frustration ratio is a better indicator for me now than k/d.